51519817 has 2 divisors, whose sum is σ = 51519818. Its totient is φ = 51519816.

The previous prime is 51519781. The next prime is 51519829. The reversal of 51519817 is 71891515.

Together with previous prime (51519781) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37896336 + 13623481 = 6156^2 + 3691^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51519817 is a prime.

It is not a weakly prime, because it can be changed into another prime (51519857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25759908 + 25759909.

It is an arithmetic number, because the mean of its divisors is an integer number (25759909).

Almost surely, 2^51519817 is an apocalyptic number.

It is an amenable number.

51519817 is a deficient number, since it is larger than the sum of its proper divisors (1).

51519817 is an equidigital number, since it uses as much as digits as its factorization.

51519817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12600, while the sum is 37.

The square root of 51519817 is about 7177.7306302201. The cubic root of 51519817 is about 372.0986581698.

The spelling of 51519817 in words is "fifty-one million, five hundred nineteen thousand, eight hundred seventeen".